<mat-toolbar color="primary">
    <button mat-icon-button (click)="openSederbar()">
      <mat-icon aria-label="label">menu</mat-icon>
    </button>
    <span>企业协作平台</span>
    <span class="fill-space"></span>
    <mat-slide-toggle (change)="onChange($event.checked)">
        黑夜模式
    </mat-slide-toggle>
</mat-toolbar>